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Finding the Fourth Proportional to 89.69, 134.28 and 84.02

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Solution

The fourth proportional to 89.69, 134.28 and 84.02 is: 125.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.69 : 134.28 = 84.02 : x
  2. Step 2: Convert to fraction form
    89.69/134.28 = 84.02/x
  3. Step 3: Cross multiply
    89.69x = 134.28 × 84.02
  4. Step 4: Simplify right side
    89.69x = 11,282.21
  5. Step 5: Solve for x
    x = 11,282.21/89.69
  6. Step 6: Final answer
    x = 125.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.